Du Pont was found just before 7 a.m. at the Laurel Highlands state prison near Somerset, state prisons spokeswoman Susan McNaughton said. He was pronounced dead a short time later at Somerset Community Hospital.

"He had had some illnesses so we are considering it natural," said McNaughton, noting that the county corner would ultimately make the determination on the cause of death. Somerset County Coroner Wallace Miller said later Thursday he was still gathering information on the death and had no immediate comment.

Du Pont was the great-great grandson of E.I. du Pont, the French-born industrialist who founded the chemical company, and one of hundreds of heirs to the family fortune.

In January 1996, he shot and killed David Shultz, 36, a 1984 gold medal winner who came to live and train at a state-of-the-art Foxcatcher National Training Center that du Pont had built on his 800-acre property in Newtown Square. After the shooting, du Pont barricaded himself inside his home for two days, but was taken into custody when he left his mansion to fix a boiler police had shut off.

The millionaire had a reputation for acting erratically, including once driving two new Lincoln Continentals into a pond on his property, one after the other. Wrestlers who had trained at Foxcatcher alleged du Pont pointed guns at them, drank too much and once kicked out a wrestler because he was black.

His lawyers also contended du Pont was insane, suffering from paranoid schizophrenia that also made him believe he was Christ and the Dalai Lama. In 1997, he was found guilty but mentally ill in Shultz's death and sentenced to 13 to 30 years in prison.

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